Science and religion both offer different views in the world. Most people who are a man or woman of science do not believe that God or other undefined figures are real. Many religious figures (pope and priests) and scientists have a conflict about the fundamental 'truths' and what the worldview can offer.
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The Kremlin is where Putin currently lives. It is a palace and several assisting buildings, with a wall around the whole thing. The Multi-domed building is St. Basil's Cathedral. The Tsar was probably in another palace, on the run from Rasputin.